<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://unpkg.com/vue"></script>
    <script>
        window.onload=function(){
           var data={counter:0}
            Vue.component('simple-counter',{
                template:"<button v-on:click='counter +=1'>{{counter}}</button>",
                data:function(){
                    return data;
                }
            })
                    var app=new Vue({
                        el:'#example'
                    })

        }



    </script>
</head>
<body>
<div id="example">
    <simple-counter></simple-counter>
    <simple-counter></simple-counter>
    <simple-counter></simple-counter>
</div>

</body>
</html>